FT. LAUDERDALE — It will take three to five weeks to determine what killed Anna Nicole Smith, but no illegal drugs have been found and initial findings have ruled out physical trauma, authorities said Friday.

At a Friday afternoon news conference, Dr. Joshua Perper, chief of the Broward County medical examiner's office, said toxicology tests were needed, but there was no immediate indication of an overdose of drugs. He said Smith had suffered for several days from stomach flu and authorities had found prescription drugs in her room.

The six-hour autopsy also seemed to rule out most physical injuries such as a stabbing or asphyxiation, he said. A minor bruise from a recent fall was found.

"We are aware of the significant public interest in this death," said Perper, who performed the autopsy. He said the office would expedite its testing "without jeopardizing the thoroughness of investigation."

As they had on Thursday, police questioned whether a crime had taken place.

"We treat any death with utmost importance," said Seminole Police Chief Charlie Tiger at the news conference. There was "no evidence revealed to suggest a crime occurred."

Tiger said police have interviewed witnesses and watched videotapes from the hotel where Smith died.

"Nothing unusual has been observed on surveillance tapes," he said.

Officials were trying to determine what had killed Smith, 39, the latest self-created blond bombshell whose life of reinvention included stripper, model, actress, possible heiress and mother of a son, Daniel, who died of a drug overdose within days of the birth of his sister, Dannielynn.

A lawyer who represented Smith in the Bahamas, Michael Scott, said he believed drugs "featured in her death," The Associated Press reported.

Her mother, Vergie Arthur, told ABC's "Good Morning America" she thought her daughter died of an overdose. "I think she had too many drugs, just like Danny," she said.

Earlier Friday, a Los Angeles judge refused to order an emergency DNA test on Smith's body as part of a dispute over the paternity of 5-month-old Dannielynn.

Although Superior Court Judge Robert Schnider rejected the DNA test request, he ordered the body of the former Playboy Playmate preserved and set Feb. 20 to argue more issues in the case.

The ruling was announced by lawyers after a closed hearing in the paternity battle. Smith's daughter could inherit millions of dollars, depending on court actions, stemming from her mother's 1994 marriage to 89-year-old oil tycoon J. Howard Marshall II. He died 14 months later.

The birth certificate identifies Dannielynn's father as attorney Howard K. Stern, Smith's most recent companion who was with her in Florida when she died, according to officials.

But Smith's former boyfriend, Larry Birkhead, insists he is the father. Birkhead had unsuccessfully sought the emergency order to test Smith's body.

"I'm very happy with the ruling. I'm OK with the timeframe," said Smith's attorney, Ron Rale. "I thought it was very disrespectful to take DNA from someone just deceased. This is just a circus for nothing."

Rale said Smith was willing to undergo DNA testing when he last spoke with her.

Birkhead was not present in court Friday. His attorney, Debra Opri, said he had stayed up all night "deeply saddened" by the death of Smith, who was the "love of his life."

A third man suggested Friday he was the father, the AP reported. Prince Frederick von Anhalt, husband of actress Zsa Zsa Gabor, said he had had an affair with Smith for a decade. He said he would file a lawsuit if Dannielynn is turned over to Stern or Birkhead.

In Florida, Perper said officials had taken a large amount of DNA material for testing and would honor the court requests from California.

Rale on Friday said he did not believe Smith was taking any illegal drugs.

On Thursday, according to police, a private nurse found Smith unconscious in her room at the Seminole Hard Rock Hotel and Casino in Hollywood, Fla.

A bodyguard performed CPR, Tiger said, but Smith was declared dead at the hospital.

Daniel Smith died on Sept. 10 in the Bahamas, around the time Smith gave birth to Dannielynn. The child is still in the Bahamas.